What causes hypovolemic?

What does low Urine Na indicate?

- Extrarenal loss of Na- Or edematous disorder

What does salt avid kidneys mean?

- Like to resorb salt- Seen in CHF

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What does normal urine Na suggest?

- Renal loss of Na- Or excess ADH

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What is hypernatremia?

Increased [Na] with a decrease in TBW relative to Na

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Pathogenesis of Hypernatremia?

- In impaired water intake, kidneys can only concentrate urine to a fixed extent of 1200 to minimize water loss - However there is still insensible water loss that will lead to HYPERnatremia- This is why we can live without water, if you aren't peeing it off, you are evaporating it off